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POSorting a subtree and storing it in an xsl:variable
 

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  1. POSorting a subtree and storing it in an xsl:variable
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    <p>I'm working with an XSL stylesheet, and I'm trying to use the method shown <a href="https://stackoverflow.com/questions/2272123/how-sort-elements-and-store-them-in-a-variable-xslt/2272522#2272522">here</a> to store a sorted subtree as a variable. I'm using saxon 8.7 vis the xml-maven-plugin to transform my XML file. Here's the code that I have:</p> <pre><code>&lt;xsl:variable name="miniDays"&gt; &lt;xsl:for-each select="//day[position() &gt; $firstPosToShow]"&gt; &lt;xsl:sort select="@date" order="descending" /&gt; &lt;xsl:copy-of select=".|@*" /&gt; &lt;/xsl:for-each&gt; &lt;/xsl:variable&gt; </code></pre> <p>When I run the stylesheet, I get the following error:</p> <pre><code>Error at xsl:copy-of on line 598 of file:/D:/home/Projects/src/main/xsl/site.xsl: XTDE0420: Cannot create an attribute node (date) whose parent is a document node </code></pre> <p>If I just set the subtree to the variable without sorting, it works, but it's not sorted:</p> <pre><code>&lt;xsl:variable name="miniDays" select="//day[position() &gt; $firstPosToShow]" /&gt; </code></pre> <p>If I set the copy-of statement's select to ".", it gets past that point, but gives me an error later on when I actually try to use the variable data. Here's how it's being used:</p> <pre><code>&lt;xsl:for-each select="exsl:node-set($miniDays)"&gt; &lt;xsl:variable name="in" select="local:calculate-total-in-days(.)" /&gt; &lt;!-- do some stuff with the var --&gt; &lt;/xsl:for-each&gt; </code></pre> <p>And the error: </p> <pre><code>Error on line 676 of file:/D:/home/Projects/src/main/xsl/site.xsl: XPTY0004: Required item type of first argument of local:calculate-total-in-days() is element(); supplied value has item type document-node() </code></pre> <p>The function:</p> <pre><code>&lt;xsl:function name="local:calculate-total-in-days"&gt; &lt;xsl:param name="days" as="element()*" /&gt; &lt;!-- Do some calculations --&gt; &lt;/xsl:function&gt; </code></pre> <p>Am I using exsl:node-set incorrectly? And what should be in the copy-of's select, "." or ".|@*"?</p>
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    1. USMatt McMinn
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    1. COShow us enough of the input XML to be able to tell what's happening.
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      1. USJim Garrison
    2. COGood question (+1). See my answer for a thourough discussion of the issues in the code and for the solution to each of these issues.
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      1. USDimitre Novatchev
 

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